Armature.



PATENTED JULY 3, 1906.

P. M. VOGEL. ARMATUBE. APPLICATION FILED AUG.4, 1905 Witnesses:

Inventor Frederick m. Voge I,

' DTttg.

. the

rasosiuck M. vocsn, or LYNN, MASSACHUSETTS, ASSIGNOR TO can ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ARMATURE.

speoificati'on of Letters Patent.

Iatentea hm, 3, 1908.

Application and August 4. 1965. Serial Ho. 272.719.

To mil whom,- z'z' "my concern:

Be it known that I, FREDERICK M. VOGEL, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful improvements in Armatures, of which the following is a specification.

This invention relates to armatures, and more particularly to the small light armatures employed in the motors of commutating electric meters.

The object of the invention is to provide an armature which though strong and rigid is of very small weight, the latter qualification being of primary importance in armatures used for this purpose in order that the weight on the bearings for the shaft, and hence the friction in the'bearings, may be reduchd to a minimum. i

In accordance with my invention I form the armature by winding the coils upon a thin hollow supporting body or shell of fabric molded, to the desired forni with integral projections thereon which serve to separate the several coils constitutin the armature. This shell is preferably of such shape that the coils wound thereon are substantially circular and completed armature spherical, for the reason that with circular coils the weight of the armature is considerably reduced, since the minimum weight of wire per ampere-turn inclosing a given area is re uire d when circular coils are used and also or the reason that with a spherical armature circular field-coils can be used with very small clearances between them and the armature, thus making the maximum number of the lines of force of the field-coils effective in producing a torque. The supporting-body on which the coils of of paper or a textile fabric which is pressed into the desired form and which is ofjust sufficient thickness to give to the completed shell the required strength and rigidity, as such a shell is 'of very small weight. Integral projections are formed on the shell which serve to separate the armature coils and hold them in proper relation. P or convenience in manufacture the supporting-body is preferably made in two parts, each of hemisgiherical cimformation, which are afterward secured together. The armature-coils are then wound thereon between the projections,

the armature are wound is preferably made .anmature'is'illustrated in Fi with the accompanying drawings, whichv show the preferred vention, and in which- Figure 1 is an elevation of onehalf of the supporting-shell. Fig. 2 is a section of the complete shell, and Fig. 3 is an elevation of the completed armature. I

Referring to the drawings, the completed 3 and consists of a central shaft 1., a thin ho low supportingshell 2, made of paper or other moldable material and having projections 3 formed integral therewith secured to shaft 1, and armature-coils 4 wound on the supporting-shell and spaced apart by the projections 3. In

embodiment of my i11 the present instance I have shown four of these armature-coils, each consisting of two coll-sections, one on each side of the central shaft 1. The supporting-shell 2 is of spherical form, except that it is flattened at the ends, so that the crossing of the armaturecoils at the ends will build them out, and thus make the completed armature of substantiall spherical shape.

T e shell 2 is preferably made in two parts, each of hemispherical form, as shown in Fig. 1, which are afterward secured together. Each of these parts is made from a circular paper blank, which is first soaked in water until it becomes pliable and is then placed in a suitably-shaped mold, where it is pressed to the shape shown in Fig. 1. The projections 3 for separating the code are formed integral with the shell by pressing the paper out into depressions in the mold. The shell is then dried by baking and the edge trimmed to make it perfectly true. N otches are cut in the edges, as in icated at 5, and the shell is then varnished inside and out. The shaft 1 is preferably a split tube, has a clamp 6 thereon, and has shoulders formed near the ends, upon which rest small washers 7. The ends of shaft 1 down to the washers 7 are insulated by the insulating-sleeves 8, as shown in Fig. 2.

9 being taken off from the end of each coil them in this relation until the shellac dries projections 'Two of the hemispherical shells are then secured together on shaft 1 by shellacking their l edges, inserting one end of theshaft through a central opening in each shell," then bringing the edges of theshells together and holding sufficiently to secure them together tightly. The supporting-body thus formed is then placed upon a winding-machine by inserting the prongs of the holding device on the machine through the openings 5, and the coils 4 are wound thereon in the usual manner, leads for attachment to a segment of the commutator. The meter-shaft is then inserted through the sleeve 1, and when the armature is properly positioned thereon'the clamp 6 is tightened up by a screw-driver inserted through one of the openin s 5 to hold the armature firmly on the she In this way a spherical armature is obtained which is quite strong enough to withstand the jarring and vibration to which it is subjected in service and which is of. very small weight.

I do not wish to be understood as limited to the exact construction which I have illustrated and described herein, as many modificaticfns can be made therein Without departing from the spirit of my invention. Such in'odifications 1 consider within the scope of my invention, and I aim to cover them by the terms of the claims appended hereto.

What I claim as new, and desire to secure by Letters Patent (f the United States,-is

1. An armature comprising a thin, hollow supporting-shell of fabric having integral thereon, and armature-coils wound upon the shell and spaced apart by the projections.

2. An armature comprising a hollow supporting-shell of moldable material having integral projections formed thereon, and armature-coils Wound upon the shell and spaced apart by the projections.

3. An armature comprising a hollow supporting-shell formed of paper and having in tegral projections thereon, and armaturecoils wound upon the shell and spaced apart by the projections.

4. 'An armature comprising a hollow supporting-shell of moldable material substantially spherical in-shape and having integral projections formed thereon, and armaturecoils wound upon the shell and spaced apart by the projections.

5. An armature compri v porting-shell of substantially spherical shape formed of paper and having integral projections thereon, and armature-miles waned,

upon the shell and spaced apartib r'theprojectionst 6. An armature comprising a hollow su-pporting-shell of moldable material substa'iir tially spherical in shape and formed of a pinrality of parts, anda plurality of armaturecoils Wound upon said shell.

sing a hollow snp 7. An armature comprising a hollow sup porting-shell made of paper and consisting of two parts each of substantially hemispherical shape which are secured together, and a plurglliltly of armature-coils wound upon said s e 8.- An armature comprising a hollow, supporting-shell made of paper and consisting of a plurality of parts secured together, said shell having integral projections formed thereon, and armature-coils wound upon the shell and spaced apart by the projections.

In witness whereof I have hereunto set my hand thisZd day of August, 1905. j FREDERICK MJVOGEL. Witnesses:

JOHN A. McMANUs, Jr, JOHN J WALKER. 

